The door access site contains information on the different types of locks used on campus. You need to update your card at a Hot Spot at least once every seven days. Hot Spots are located throughout campus and a list can be found here.
If you are having difficulties with your card, you'll need to visit the Talon One Service Center on the first floor of the Carmichael Student center. If your card is otherwise working properly but you need access to a specific room, please contact your department's admin so they can submit a request on your behalf.